Vivek Wadhwa writes about his pet issue yet again, with this article including the key point about his evidence, "I tell Desai’s and others’ stories in my book," and at least this time a reference to an study by the Kauffman Foundation

http://www.kauffman.org//uploadedFiles/Then_and_now_americas...

of which he was the principal author.

Get ready for the key statistic from the report: "The proportion of immigrant-founded companies nationwide has dropped from 25.3 percent to 24.3 percent since 2005. While the margins of error of these numbers overlap, they nonetheless indicate that immigrant-founded companies’ dynamic period of expansion has come to an end." Okay, so the change in percentage is within the standard error of measurement; a percentage change of that kind would be seen even if there were more immigrant-founded companies than ever, as long as more native-born Americans than ever found companies; and there is NO indication that Silicon Valley's flood of innovation has ceased.

What is the problem here? Quantitatively, what is the proof that any policy change is needed?

AFTER EDIT: Responding to the offense taken by the replies kindly posted below, let me explain my position. My PERSONAL position on immigration to the United States as a matter of policy is that I would be happy to see it go back to the way it was in the 1870s, when anyone could immigrate from anywhere with hardly any regulation of immigration at all. All of my ancestors arrived in the United States by those rules--all of my ancestors were in North America well in advance of the building of the immigration processing station at Ellis Island in New York City.

I am intimately familiar with United States immigration law, having formerly worked as an immigration lawyer (as described in my user profile here on Hacker News) and being the husband of a first-generation immigrant to the United States from Taiwan. I have lived abroad for six years of my life (in two separate three-year stays), so I have a pretty good idea of how one country treats foreign residents from America. The clients for my current occupation, teaching mathematics lessons through a local nonprofit organization, included first-generation immigrants from China, India, Russia, Romania, the Philippines, Korea, Ghana, Indonesia, Pakistan, Turkey, and other countries I may be forgetting at the moment. I like immigrants, and I like America to be full of immigrants--that makes life here more interesting.

But to persuade the legislative process in the United States to change the rules requires more convincing evidence than the anecdotes that Vivek Wadhwa repeatedly brings forward. Another comment here astutely pointed out that the recent trend line in immigration from Taiwan is that entrepreneur immigration to the United States is decreasing. That's because Taiwan has democratized, liberalized, and prospered during my lifetime. Now people who were born in Taiwan can pursue their advanced education in many different countries, being well prepared by the generally excellent primary and secondary education there, and then can decide for themselves where to settle to establish a career. They can go back to the country where they grew up and where their relatives and childhood friends live if they like. I think it's great for people to have choice like that. I don't think it is any problem for the United States at all if people from Taiwan develop their entrepreneurial businesses in Taiwan. The same is true of India and China. People from India and China continue to come to the United States in large numbers, as I can personally observe. Some study here and then go back to the countries of their birth. No one has made a case that United States policy has to change much to influence the numbers one way or another.